Amazon’s stock gains added close to $ 7.8 billion to Bezos’ net worth in a single day, according to Bloomberg. Bezos owns a 17 percent stake in Amazon, in addition to his Blue Origin holdings and stake in the Washington Post.

Amazon has seen its stock price spike close to 47 percent since the beginning of the year. Amazon’s market value tops $ 500 billion, joining Apple, Microsoft, Facebook and Google parent Alphabet as the only publicly traded companies above that mark.